- Post
- #1618987
- Topic
- ROTJ SE cinema DTS synchronize help
- Link
- https://originaltrilogy.com/post/id/1618987/action/topic#1618987
- Time
With AudaCity i can only adjust in 0,001% steps and this is not accurate enough.
How ‘not accurate’ are we talking about?
When you are using Audactiy and lining-up the two files—a reel from the DTS audio file and 1997-reference audio file—how ‘out-of-sync’ is the DTS audio file away from the 1997 reference audio file?
Bear in mind that one film-frame is displayed at approximately 42 milliseconds when projected at either 24fps or 23.976fps. So, if both audio files start at the same time but the DTS audio drifts out-of-sync by more or less than 42 milliseconds by the end of one reel, then you have a problem where you will notice the audio being out-of-sync with the frames. So your goal is to use Audactiy to adjust the duration of the DTS audio to be as close to the reference audio as possible—well below 42 milliseconds. For example, if the closest that Audacity can get to encoding the duation of the DTS audio to match the duration of the reference-audio is 20 milliseconds behind the reference-audio, then I would slide the encoded DTS audio so that it starts 10 milliseconds after the start of the reference audio and ends at 10 milliseconds before the reference audio. And you would be doing that for each audio reel. When you are watching the film with your edited audio-track, your brain won’t notice the 10 millisecond out-of-sync error.